1/* Copyright (C) 1997-2023 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#ifndef _AIO_MISC_H
19#define _AIO_MISC_H 1
20
21#include <aio.h>
22#include <pthread.h>
23
24
25/* Extend the operation enum. */
26enum
27{
28 LIO_DSYNC = LIO_NOP + 1,
29 LIO_SYNC,
30 LIO_READ64 = LIO_READ | 128,
31 LIO_WRITE64 = LIO_WRITE | 128
32};
33
34
35/* Union of the two request types. */
36typedef union
37 {
38 struct aiocb aiocb;
39 struct aiocb64 aiocb64;
40 } aiocb_union;
41
42
43/* Used to synchronize. */
44struct waitlist
45 {
46 struct waitlist *next;
47
48 /* The next two fields is used in synchronous `lio_listio' operations. */
49#ifndef DONT_NEED_AIO_MISC_COND
50 pthread_cond_t *cond;
51#endif
52 int *result;
53
54 volatile unsigned int *counterp;
55 /* The next field is used in asynchronous `lio_listio' operations. */
56 struct sigevent *sigevp;
57 };
58
59
60/* Status of a request. */
61enum
62{
63 no,
64 queued,
65 yes,
66 allocated,
67 done
68};
69
70
71/* Used to queue requests.. */
72struct requestlist
73 {
74 int running;
75
76 struct requestlist *last_fd;
77 struct requestlist *next_fd;
78 struct requestlist *next_prio;
79 struct requestlist *next_run;
80
81 /* Pointer to the actual data. */
82 aiocb_union *aiocbp;
83
84 /* List of waiting processes. */
85 struct waitlist *waiting;
86 };
87
88
89/* Lock for global I/O list of requests. */
90extern pthread_mutex_t __aio_requests_mutex attribute_hidden;
91
92
93/* Enqueue request. */
94extern struct requestlist *__aio_enqueue_request (aiocb_union *aiocbp,
95 int operation)
96 attribute_hidden;
97
98/* Find request entry for given AIO control block. */
99extern struct requestlist *__aio_find_req (aiocb_union *elem) attribute_hidden;
100
101/* Find request entry for given file descriptor. */
102extern struct requestlist *__aio_find_req_fd (int fildes) attribute_hidden;
103
104/* Remove request from the list. */
105extern void __aio_remove_request (struct requestlist *last,
106 struct requestlist *req, int all)
107 attribute_hidden;
108
109/* Release the entry for the request. */
110extern void __aio_free_request (struct requestlist *req) attribute_hidden;
111
112/* Notify initiator of request and tell this everybody listening. */
113extern void __aio_notify (struct requestlist *req) attribute_hidden;
114
115/* Notify initiator of request. */
116extern int __aio_notify_only (struct sigevent *sigev) attribute_hidden;
117
118/* Send the signal. */
119extern int __aio_sigqueue (int sig, const union sigval val, pid_t caller_pid)
120 attribute_hidden;
121
122#endif /* aio_misc.h */
123